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Old 06-22-2006, 02:50 AM   #1
reddevil
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Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default 2.0 Twin turbo throttle body versus 2.2 NA throttle body

BIG difference. The opening on our throttle bodies are 2 9/16" in dieameter. The twin turbo throttle body is only 2 1/8" in diameter. WOW.





I am swapping out the NA throttle body to the twin turbo manifold. I have to make a 1/4" spacer though.

The ports to the heads though are HUGELY different in the opposite direction though. Weird.
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Old 06-22-2006, 02:10 PM   #2
Legacy777
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Location: Houston, Tx
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1990 Legacy & 97 OBS
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That is a HUGE difference.....wonder why they did that?
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Old 06-22-2006, 02:35 PM   #3
PHATsuby
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2001 Legacy GT back
to stock is a project too

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Josh, I would think you would know as well as anyone, the TB opening size is not nearly as critical in a FI application compared to NA That being said, that is a decent difference but that is what I would guess the reason is.

Ben
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Old 06-23-2006, 02:06 PM   #4
Legacy777
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AWD 6MT EJ22T AWIC Swap

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Yeah I know....but still....even with FI, larger opening will have less pressure drop/restriction.
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